156

PERFUMES AND THEIR PREPARATION.

revolving. The adjoining illustration (Fig. 32) shows such a
contrivance which is required also in the manufacture of per-
fumes. The rotation may be effected by clockwork, water
power, or any other motor.

Pomades being solid must be divided into small pieces
which may be done with a knife, but the following procedure
is more suitable and less laborious.- The pomade is-placed
in a tin cylinder four inches wide and about a foot high, which
is open at one end, the other being closed with a tin plate
having several fine openings. The cylinder filled with po-
made is set upon the bottle containing the alcohol for extrac-

FIG. 32.
tion, and the pomade is pressed through the openings in the
shape of thin threads by means of a piston.
In this way, of course, the pomade acquires a very large
surface and rapidly yields the aromatic substance to the
alcohol. The odor of the pomade differs according to the
length of time which it has been subjected to the flowers, and
on being treated with alcohol furnishes extracts of corre-
sponding strength. This should be borne in mind in the manu-
facture of perfumes which are intended to be uniform in
quality.
After two cold and one warm infusion of the pomade, it
may be made to yield some more aromatic material by heat-
ing it carefully to its exact melting-point, when extract agstin.